P0420 code
#5
RE: P0420 code
Personally, my 99 has had the P0420 code for 8 years now, and never once has it caused the car to shudder or hesitate, nor go into limp mode. Not having a cat would be your #1 reason for the code, #2 would be having a bad O2 sensor if you did have a working cat.
#7
RE: P0420 code
OK. Just making sure. I've never had a car go into "limp mode" before, but I have heard of plenty of members talking about it. So the shudder is probably coming from somewhere else then. Let's try to help.
How old are the spark plugs? What kind of plugs are in there (brand)?
How long since you checked or changed the distributor cap & rotor?
Check the spark plug wires for damage. Manually look at each wire. Then, in a dark garage, have the engine running and spray a mist of water over the wires. If you see any sparks or light coming from anywhere on the wires (arcing), you got a plug wire problem.
How old are the spark plugs? What kind of plugs are in there (brand)?
How long since you checked or changed the distributor cap & rotor?
Check the spark plug wires for damage. Manually look at each wire. Then, in a dark garage, have the engine running and spray a mist of water over the wires. If you see any sparks or light coming from anywhere on the wires (arcing), you got a plug wire problem.
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